Air propeller



June 28;, 1927.

.- 1,633,611 A. E. SHORT ET AL AIR PROPELLER -F'1led Oct. 11, 1926 2 Shuts-Sheet. 1

June 28 1927. A. a SHORT ET AL AIR PROPELLER 'F'iledOt. 11. 1926 2 Sheets-Sheet 2 Patented June 28 1927.

UNITED STATES v 1,633,612 PATENT OFFICE.

ALBERT EUSTACE SHORT, HUGH OSWALD SHORT, AND ARTHUR GOUGE, OF ROCHESTER, ENGLAND.

AIR PROPELLER.

Application filed October 11, 1926, Serial No.-

This invention relates to two-bladed air propellers, in which each blade is constructed a separate unit which may be detached from the propeller and replaced when re-- quired. Each blade is of a length in excess of halt the total diameter of the propeller, the inner ends of the blades being slotted longitudinally in such a way that when the inner ends of the two blades are brought together the flat inner ends of the two blades intersect each other at or about right angles.

Four wedge-shaped packing blocks are located between the crossing portions of the blades, and are so shaped to constitute the boss of the propeller when assembled with the inner ends of the blades. Two of the blocks form the ends of the propeller boss, and the two other blocks constitute the sides of the boss.

The propeller blades and wedge-shaped packing blocks are bolted together by two series of bolts. The bolts of one series are parallel with the axis of the propeller and each bolt passes through the end packing blocks and through both blades and through one wedge-shaped side block between the blades. The other seriesof bolts are arranged transversely to the axis of the propeller and each bolt of this series passes through both side packing blocks, both blades, and one wedge-shaped end block.

In the drawings, Figures 1. and 2 are respectively end elevation and side elevation of the propeller with the blades and wedgeshaped blocks bolted together.

Figure 3 is a cross section of the inner ends of the blades and the packing blocks, separated from each other. 7

Figure 4 is a detail view of the inner ends of two blades separated and ready to be brought together to intersect.

Figures 5 and 6 illustrate diagrammatically the relative positions of the two blades when the inner ends intersect each other at other than right angles.

1 and 2 are the separately constructed blades, and 1 and 2 show the longitudinal notches cutin the ends of the said blades 1 and 2. I

The blades 1 and 2 are shown in the View at Figure 3 in the intersecting position. 3 and 4 are the end packing blocks, and 5 and 6 the side packing blocks, which, when brought into place, fill the angular spaces be- 140,893, and in Great Britain March 1, 1926;

tween the crossing inner ends of the propeller blades.

A bolt 7 passes through a hole in the left packing block 3, a hole in the blade 1, a hole in the side packing block 5, a hole in the blade 2, and finally through a hole in the packing block 4, thus notonly holding the block 3 to the block 4 by the tension exerted by the nut on the bolt 7, but keying the structure together by passing transversely through the adjacent side block 5. In like manner other bolts which run parallel with the axis of the propeller pass through the end packing blocks 3 and 4, both blades 1 and 2, and the side packing block- 6. Bolts 8 passing through the packing blocks 5 and 6 pass through both propeller blades, and throughone or other of the end packing blocks 3 or 4.

Figures 5 and 6 are diagrams illustrating intersections of the blades other than at right angles. This variation in the relative angular positions-of the two blades cannot be extended beyond that angular relation where opposite packing blocks, in being bolted together, may not be keyed to the packing blocks located at right angles to them, by the bolts passing through from end to end. or side to side.

9 is a washer ring through which the bolts 7 pass. The propeller shaft is marked 11, and is i lustrated as having a flange 10 against the boss of the propeller and an extension 12 passing centrally through the packing blocks 3 and 4 and through the inner ends of both of the blades 1 and 2. It is of course evident that propellers constructed in accordance with this invention may be fitted to their shafts in any other convenient way.

What we claim as our invention and dcsire to secure by Letters Patent is 1. An air propeller with removable blades, comprising two blades with interlocking inner ends, two wedge-shaped side blocks located in opposite recesses between the blades, two wedge-shaped end blocks located in the other recesses between the blades, longitudinally arranged bolts securing the blades and blocks together by passing through the opposite endv blocks and through the blades between them, and transversely arranged bolts securing the blades and blocks together by passing through the opposite side blocks and through the blades between them.

2. An air propeller with removable blades, comprising two blades With inter- :i locking inner ends, two Wedge-shaped side blocks located in opposite recesses between the blades, two wedge-shaped end blocks located in the other recesses between the blades, longitudinally arranged bolts securing the blades and blocks together, each bolt passing,- through the opposite end blocks, through both blades, and through one of the side blocks between the blades,' and transversely arranged bolts securing the ALBERT EUSTACE SHORT. HUGH OSWALD SHORT. ARTHUR GOUGE. 

